A computer includes a casing, an electronic assembly, and a water cooling assembly. The casing, forms an accommodation space. The casing has an interior fluid channel located at at least one side of the casing, and a fluid inlet and a fluid outlet which are in fluid communication with the interior fluid channel. The electronic assembly is located in the accommodation space. The water cooling assembly includes a first water block and a radiator. The first water block is in thermal contact with the electronic assembly, the first water block, the radiator, and the interior fluid channel located at the at least one side of the casing are in fluid communication with each other so as to form a circulation channel, and the fluid inlet and the fluid outlet of the casing are respectively in fluid communication with the radiator and the first water block.